http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
헬륨가스분사법으로 제조된 Al86Ni6Ce4Mg4 비정질합금 분말과 성형재의 특성
배차헌,김성규,이병우,박흥일,정해용 ( Cha Hurn Bae,Sung Gyoo Kim,Byung Woo Lee,Heung Il Park,Hae Yong Jeong ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.2
N/A ]Properties of Al_(86)Ni_6Ce₄Mg₄, alloy powder produced by helium gas atomization process were investigated by using DSC, XRD, SEM and TEM. The powders below 32㎛ in diameter were identified as an amorphous phase mixed with a α-Al phase. Al_(86)Ni_6Ce₄Mg₄, bulk alloy was manufactured by hot extruding the alloy powders at various temperatures, and the estimation of its mechanical properties was carried out subsequently. As a result, the bulk alloy extruded at the temperature below 450℃ exhibited the microstructure in which the near-spherical shape of some powders below 20㎛ were nearly unchanged and fine voids between matrix and powders were formed during extrusion process. On the other hand, the tensile strength and elongation at room temperature for Al_(86)Ni_6Ce₄Mg₄, bulk alloy extruded at 450℃ were 750㎫ and 7.5%, respectively.
분사주조공정에 의하여 제조된 Al-Pb 과편정합금의 조직특성
배차헌,정해용,박흥일,김창업,이성렬 ( Cha Hurn Bae,Hae Young Jeong,Heung Il Park,Chang Up Kim,Sung Ryeol Lee ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.4
N/A In Al-Pb monotectic alloys Pb particles are difficult to uniformly distribute over the Al matrix because of the gravity segregation of pb element. Therefore the effects of centrifugally spray casting process on microstructures and distributions of Pb particle were investigated. As the preform thickened the sine of Pb particle became larger, the amount of porosity became lower and microstructures showed the change from spray-deposition microstructures in the lower part of the preform to spray-casting microstructures in the upper part of it. The size of Pb particles, amount of porosity and splat layer boundaries in hot forged preform showed still less than of as-deposited preform
박흥일,배차헌 ( Heung Il Park,Cha Hurn Bae,Siegfried Engler ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.2
N/A The purpose of this paper is to describe the solidification characteristics and the formation mechanism of in-situ composite structure with multilayer in the hypereutectic gray cast iron preform produced by centrifugal atomized spray casting process. The experimental work has been carried out in dry air atmosphere in the spray chamber. With increasing the thickness of preform, the solidification structure changes from a typical spray deposition structure with the splat boundaries to a typical spray casting structure without the splat boundaries. The effectiveness and the density of graphite nucleation, and the kinetics of growth of graphite should be higher on the interface of splats than the inner portion of splat. Consequently, graphite nucleates and grows preferentially on the interface of splats, and these splats are self-bonded tightly by the growth of graphite. The solidification mode of each splat showed the latest solidified zone in the center of splat, and these splats were consolidated with the unit component of in-situ composite structure which consists of the layer of graphite colonies, the layer of ferritic and pearlitic matrix, and the layer of segregated phase such as phosphides.
분사주조에 의한 입자강화 금속기지 복합재료의 제조시 액적의 열적거동과 미세조직에 대한 고찰
김명호,배차헌,정해용,박흥일 ( Myung Ho Kim,Cha Hurn Bae,Hae Young Jeong,Heung Il Park ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.4
N/A Particle-reinforced metal matrix composites via the Osprey spray casting process were fabricated by injecting second phase particles of Al₂O₃(<40㎛) and W(6㎛) into the spray of Cu droplets, and the thermal behaviors of the composite droplets during flight were considered theoretically on the basis of mixing modes between the Cu droplets and the reinforced particulates injected. It was found that the W-injected spray is comprised of particle-embedded droplets, and the Al₂O₃-injected spray comprises particle-attached droplets. From the predicted results of the thermal behaviors of the composite droplets and preforms produced, it is concluded that the thermal behaviors of the composite droplets during flight, and during the subsequent deposition are strongly influenced by its mixing modes between the reinforced particulates and Cu droplets during flight.
박흥일,김우열,배차헌,김명호 ( Heung Il Park,Woo Yeol Kim,Cha Hurn Bae,Myung Ho Kim ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.4
N/A The effects of alloying elements on the structure and mechanical properties of compacted/vermicular graphite cast irons containing copper, tin and molubdenum for producing pearlite matrix, and also containing phosphorus and boron for increasing wear resistance, were investigated. The Brinell hardness and ultimate tensile strength of the specimens with the range of compositions, [1.5% Cu-0.05% Sn-(0.2-0.4)% Mo-(0.2-0.6)% P-(0.035-0.070)% B], was found to fall within in the following range, depending on their composition; Brinell hardness of BHN 250-315, ultimate tensile strength of 28.1-40.3㎏/㎟. It was also found within this experiment that CV graphite cast irons possessing higher amount of phosphide eutectic exhibit better wear resistance, but the wear resistance became deteriorate when the area fraction of phosphide eutectics exceed more than 10%. From these experimental results, it could be concluded that the CV graphite cast iron containing 1.5% Cu, 0.05% Sn, 0.4% Mo, 0.2% P and 0.035% B showed good mechanical and wear resistance properties.
김명호,박흥일,김우열,배차헌 ( Myung Ho Kim,Heung Il Park,Woo Yeol Kim,Cha Hurn Bae ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.6
N/A This study was undertaken to obtain an improved understanding of the effects of alloying elements on the residual amounts of Mg in the melt and on the resultant microstructure of compacted vermicular graphite cast irons, and the influence of alloying elements and cooling rates during solidification on the formation of phosphide eutectics, and on the mechanical properties of compacted vermicular graphite cast irons containing copper, tin, molybdenum for producing pearlitic matrix, and also containing phosphorus and boron for increasing wear resistance were evaluated.